ruby: Import the latest ruby changes from gems.

This was done with an automated process, so there could be things that were
done in this tree in the past that didn't make it.  One known regression
is that atomic memory operations do not seem to work properly anymore.

1 files changed, 60 insertions, 0 deletions

diff --git a/src/mem/ruby/system/RubyPort.hh b/src/mem/ruby/system/RubyPort.hh
new file mode 100644
index 000000000..2f391070f
--- /dev/null
+++ b/src/mem/ruby/system/RubyPort.hh
@@ -0,0 +1,60 @@
+#ifndef RUBYPORT_H
+#define RUBYPORT_H
+
+#include "mem/ruby/libruby.hh"
+#include <string>
+#include <assert.h>
+
+using namespace std;
+
+class RubyPort {
+public:
+  RubyPort(const string & name)
+    : m_name(name)
+  {
+    m_port_id = m_num_ports++;
+    m_request_cnt = 0;
+    m_hit_callback = NULL;
+    assert(m_num_ports <= 2048); // see below for reason
+  }
+  virtual ~RubyPort() {}
+
+  virtual int64_t makeRequest(const RubyRequest & request) = 0;
+
+  void registerHitCallback(void (*hit_callback)(int64_t request_id)) {
+    assert(m_hit_callback == NULL); // can't assign hit_callback twice
+    m_hit_callback = hit_callback;
+  }
+
+protected:
+  const string m_name;
+  void (*m_hit_callback)(int64_t);
+
+  int64_t makeUniqueRequestID() {
+    // The request ID is generated by combining the port ID with a request count
+    // so that request IDs can be formed concurrently by multiple threads.
+    // IDs are formed as follows:
+    //
+    //
+    //   0        PortID                         Request Count
+    // +----+---------------+-----------------------------------------------------+
+    // | 63 |     62-48     |                         47-0                        |
+    // +----+---------------+-----------------------------------------------------+
+    //
+    //
+    //  This limits the system to a maximum of 2^11 == 2048 components
+    //  and 2^48 ~= 3x10^14 requests per component
+
+    int64_t id = (static_cast<uint64_t>(m_port_id) << 48) | m_request_cnt;
+    m_request_cnt++;
+    // assert((m_request_cnt & (1<<48)) == 0);
+    return id;
+  }
+
+private:
+  static uint16_t m_num_ports;
+  uint16_t m_port_id;
+  uint64_t m_request_cnt;
+};
+
+#endif